<template>
    <div ref="wrapper">
        <slot></slot>
    </div>
</template>

<script type="text/ecmacript-6">
import BScroll from 'better-scroll'

export default {
    props: {
        probeType: {
            type: Number,
            default: 1
        },
        click: {
            type: Boolean,
            default: true
        },
        data: {
            type: Array,
            default: null
        },
        listenScroll: {
            type: Boolean,
            default: false
        },
        pullUp: {
            type: Boolean,
            default: false
        },
        beforeScroll: {
            type: Boolean,
            default: false
        },
        refreshDelay: {
            type: Number,
            default: 20
        }
    },
	mounted () {
		setTimeout(() => {
			this._initScroll()
		},20)
	},
	methods : {
		_initScroll () {
			if(!this.$refs.wrapper) {
				return
			}
            this.scroll = new BScroll(this.$refs.wrapper, {
                probeType: this.probeType,
                click: this.click
            })
            if(this.listenScroll) {
                let _this = this
                this.scroll.on('scroll', pos => {
                    _this.$emit('scroll', pos)
                })
            }
            if (this.pullUp) {
                this.scroll.on('scrollEnd', () => {
                    if (this.scroll.y <= (this.scroll.maxScrollY + 50)) {
                        this.$emit('scrollToEnd')
                    }
                })
            }
            if (this.beforeScroll) {
                this.scroll.on('beforeScrollStart', () => {
                    this.$emit('beforeScroll')
                })
            }
		},
        enable() {
            this.scroll && this.scroll.enable()
        },
        disable() {
            this.scroll && this.scroll.disable()
        },
        refresh() {
            this.scroll && this.scroll.refresh()
        },
        scrollTo() {
            this.scroll && this.scroll.scrollTo.apply(this.scroll, arguments)
        },
        scrollToElement() {
            this.scroll && this.scroll.scrollToElement.apply(this.scroll, arguments)
        }
	},
	watch : {
		data () {
			setTimeout(() => {
				this.refresh()
			}, this.refreshDelay)
		}
	}
}
</script>
